diff options
| author | Maurus Cuelenaere <mcuelenaere@gmail.com> | 2009-04-08 14:30:33 +0000 |
|---|---|---|
| committer | Maurus Cuelenaere <mcuelenaere@gmail.com> | 2009-04-08 14:30:33 +0000 |
| commit | c606fd04c8b8a00994ec1d2b33cdbdec71726b37 (patch) | |
| tree | 14f9e0ce8637efc3ec28eb6d7232cb3ebed218b9 /firmware/target/mips/ingenic_jz47xx/crt0.S | |
| parent | 87efb79682577742e8992c37d15f40ffd5832030 (diff) | |
Jz4740:
* Optimize & cleanup thread handling a bit
* Unify exception return and fix a potential bug
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20659 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/mips/ingenic_jz47xx/crt0.S')
| -rw-r--r-- | firmware/target/mips/ingenic_jz47xx/crt0.S | 76 |
1 files changed, 14 insertions, 62 deletions
diff --git a/firmware/target/mips/ingenic_jz47xx/crt0.S b/firmware/target/mips/ingenic_jz47xx/crt0.S index 6ac40c2f52..af82ad5d12 100644 --- a/firmware/target/mips/ingenic_jz47xx/crt0.S +++ b/firmware/target/mips/ingenic_jz47xx/crt0.S @@ -216,10 +216,10 @@ _init_stack_loop: .section .vectors, "ax", %progbits real_exception_handler: addiu sp, -0x80 - sw ra, 0(sp) - sw fp, 4(sp) - sw gp, 8(sp) - sw t9, 0xC(sp) + sw ra, 0(sp) + sw fp, 4(sp) + sw gp, 8(sp) + sw t9, 0xC(sp) sw t8, 0x10(sp) sw s7, 0x14(sp) sw s6, 0x18(sp) @@ -274,60 +274,10 @@ real_exception_handler: _int: jal intr_handler nop - lw ra, 0(sp) - lw fp, 4(sp) - sw gp, 8(sp) - lw t9, 0xC(sp) - lw t8, 0x10(sp) - lw s7, 0x14(sp) - lw s6, 0x18(sp) - lw s5, 0x1C(sp) - lw s4, 0x20(sp) - lw s3, 0x24(sp) - lw s2, 0x28(sp) - lw s1, 0x2C(sp) - lw s0, 0x30(sp) - lw t7, 0x34(sp) - lw t6, 0x38(sp) - lw t5, 0x3C(sp) - lw t4, 0x40(sp) - lw t3, 0x44(sp) - lw t2, 0x48(sp) - lw t1, 0x4C(sp) - lw t0, 0x50(sp) - lw a3, 0x54(sp) - lw a2, 0x58(sp) - lw a1, 0x5C(sp) - lw a0, 0x60(sp) - lw v1, 0x64(sp) - lw v0, 0x68(sp) - lw $1, 0x6C(sp) - lw k0, 0x70(sp) - mtlo k0 - nop - lw k0, 0x74(sp) - mthi k0 - nop - lw k0, 0x78(sp) - nop - mtc0 k0, C0_STATUS # Status register - sll zero, 1 - sll zero, 1 - sll zero, 1 - sll zero, 1 - lw k0, 0x7C(sp) - nop - mtc0 k0, C0_EPC # Exception Program Counter - sll zero, 1 - sll zero, 1 - sll zero, 1 - sll zero, 1 - addiu sp, 0x80 - eret # Exception Return - nop + j _exception_return _exception: - add a0, sp, $0 + move a0, sp mfc0 a1, C0_CAUSE # C0_CAUSE of last exception sll zero, 1 sll zero, 1 @@ -340,10 +290,12 @@ _exception: sll zero, 1 jal exception_handler nop - lw ra, 0(sp) - lw fp, 4(sp) - sw gp, 8(sp) - lw t9, 0xC(sp) + +_exception_return: + lw ra, 0(sp) + lw fp, 4(sp) + lw gp, 8(sp) + lw t9, 0xC(sp) lw t8, 0x10(sp) lw s7, 0x14(sp) lw s6, 0x18(sp) @@ -375,15 +327,15 @@ _exception: mthi k0 nop lw k0, 0x78(sp) - nop mtc0 k0, C0_STATUS # Status register + nop sll zero, 1 sll zero, 1 sll zero, 1 sll zero, 1 lw k0, 0x7C(sp) - nop mtc0 k0, C0_EPC # Exception Program Counter + nop sll zero, 1 sll zero, 1 sll zero, 1 |